Method for producing oriented high-silicon steel cold-rolled sheet by using directional solidification plate blank

A technology of directional solidification and cold rolling of thin plates, which is applied in chemical instruments and methods, metal rolling, manufacturing tools, etc., can solve the problems of complex process, difficulty of high silicon steel, long process production cycle, etc., achieve process simplification, improve efficiency, The effect of cost reduction

Inactive Publication Date: 2011-08-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to produce oriented high-silicon steel with these tec

Method used

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  • Method for producing oriented high-silicon steel cold-rolled sheet by using directional solidification plate blank
  • Method for producing oriented high-silicon steel cold-rolled sheet by using directional solidification plate blank
  • Method for producing oriented high-silicon steel cold-rolled sheet by using directional solidification plate blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Re-melt the high-silicon steel ingot containing 5% silicon and 60ppm boron, and use directional equipment for directional solidification. Columnar crystals grow along the direction. The melt temperature is 1480°C and the temperature gradient is controlled at 70K / cm. Typical Metallographic structure such as figure 1 , The thickness of the solidified slab is 5mm.

[0018] The surface of the slab is pretreated and rolled at a low temperature. The starting rolling temperature is 500°C, the final rolling temperature is 200°C, the reduction in each pass is 15%, the final warm rolling thickness of the slab is 1.5mm, and the total reduction rate is 70%; figure 2 45° ODF diagram of the thin plate after warm rolling.

[0019] The warm-rolled sheet is pickled and surface-polished, and then cold-rolled at room temperature. The reduction in the first pass is 60%, and the reduction in the second pass is 20%. After that, the cold-rolling is repeated until the thickness reaches 0....

Embodiment 2

[0022] Re-melt the high-silicon steel ingot containing 6.5% silicon and 1500ppm boron, and use directional equipment for directional solidification. Columnar crystals grow along the direction. The melt temperature is 1530°C and the temperature gradient is controlled at 200K / cm. After solidification The slab thickness is 15mm.

[0023] The surface of the slab is pretreated and rolled at a low temperature. The starting rolling temperature is 700°C, the final rolling temperature is 200°C, the reduction in each pass is 20%, the final warm rolling thickness of the slab is 2.0mm, and the total reduction rate is 87%;

[0024] The warm-rolled sheet is pickled and surface-polished, and then cold-rolled at room temperature. The reduction in the first pass is 10%, and the reduction in the second pass is 8%. After that, the cold-rolling is repeated until the thickness reaches 0.3mm.

[0025] Then, the surface of the cold-rolled sheet is treated and annealed for secondary recrystallizati...

Embodiment 3

[0027] Re-melt the high-silicon steel mother ingot with 8.5% silicon and 2000ppm boron, and use directional equipment for directional solidification. Columnar crystals grow along the direction. The melt temperature is 1590°C and the temperature gradient is controlled at 300K / cm. After solidification The slab thickness is 10mm.

[0028] The surface of the slab is pretreated and rolled at a low temperature. The starting rolling temperature is 900°C, the final rolling temperature is 400°C, the reduction per pass is 15%, the final warm rolling thickness of the slab is 1.5mm, and the total reduction rate 85%;

[0029] The warm-rolled sheet is pickled and surface-polished, then cold-rolled at room temperature, with a reduction of 30% in the first pass and a reduction of 20% in the second pass, and then repeated cold-rolling until the thickness reaches 0.3mm.

[0030] Then, the surface of the cold-rolled sheet is treated and annealed for secondary recrystallization to obtain an ori...

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Abstract

The invention relates to a method for producing an oriented high-silicon steel cold-rolled sheet by using a directional solidification plate blank and belongs to the technical field of metal material preparation. The process technology comprises the following steps of: vacuum melting a mother casting ingot comprising the following components of 4.5-10.0 percent of silicon, 50-2,000ppm of boron and the balance of ferrum; re-melting the mother casting ingot and directionally solidifying to form a columnar grain structure growing in a (100) direction, wherein the thickness of the plate plank is 2-16mm; directly rolling at low temperature along the directional solidifying direction, wherein the rolling temperature is controlled to be between 200 and 950DEG C, the rolled thickness of the plate blank is controlled to be 1.0-3.0mm and the deformation is 50-90 percent; and directly rolling a temperature rolling plate subjected to acid pickling, carrying out multi-pass cold rolling and obtaining the final plate thickness of 0.5-0.1mm. The method has the advantages that the rolling is carried out below the re-crystallization temperature; the characteristics of the original directional solidifying structure are retained; the process flow is greatly simplified; and the method facilitates the secondary re-crystalization after cold rolling to obtain the oriented structure and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a method for preparing an oriented high-silicon steel cold-rolled sheet by directional solidification slab, and more specifically relates to a method for preparing a high-silicon steel sheet by direct low-temperature rolling and cold rolling of an oriented slab. Background technique [0002] Silicon steel, also known as electrical steel, is the most widely used soft magnetic alloy. The silicon content of electrical steel sheets commonly used in the market is generally between 1.5 and 3.5% (weight percentage, the same below). It is widely used in the manufacture of generators, motors, transformers, transformers, relays, and other electronic appliances. The silicon content of high silicon steel exceeds 3.5%. With the increase of silicon content, the magnetic properties of silicon steel are continuously improved, such as the increase of resistivity, the increase o...

Claims

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Application Information

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IPC IPC(8): B21B3/00B21B37/00C30B28/06B22D27/04
Inventor 林均品房现石邓云生梁永锋叶丰陈国良
Owner UNIV OF SCI & TECH BEIJING
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